Coal bed reservoir simulation with geostatistical property realizations for simultaneous multi-well production history matching: A case study from Illinois Basin, Indiana, USA
Coal bed reservoir simulation with geostatistical property realizations for simultaneous multi-well production history matching: A case study from Illinois Basin, Indiana, USA
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DOI：
10.1016/j.coal.2014.06.002
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发表时间：
2014-09-01
影响因子：
5.6
通讯作者：
Mastalerz, Maria
中科院分区：
文献类型：
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作者：
Karacan, C. Ozgen;Drobniak, Agnieszka;Mastalerz, Maria
煤层除气是从煤中滞留的瓦斯气体中回收能量的手段，也是通风的补充措施，被证明是将煤矿瓦斯排放减少到安全水平的最有效方法之一。储层模拟可能是评估煤层作为“气藏”及其流体储存和流动相关特性的最有效方法。这一目标是通过利用井筒生产的历史匹配来实现的。利用多井历史匹配进行储层模拟是一个繁琐的过程，因为影响油井生产特征的重要煤属性在整个煤层上是空间变化的。常见的做法是在历史匹配过程中改变井区的各种属性，并假设它们在感兴趣的域中是一致的。然而，这一过程通常不会为井或煤储层管理产生现实和有效的结果。在这项工作中，针对伊利诺伊州盆地的一组煤层气井演示了煤层储层模拟的多级方法，这些煤层气产自印第安纳州卡本代尔群（宾夕法尼亚州）林顿组的西利维尔煤层。该方法依次包括井的气水产能分析、地质统计模拟和联合模拟以及煤层储层模拟。结果表明，利用重要煤炭属性地质统计图的储层模型对于所有井的同步历史匹配是有效的，并且消除了猜测和改变单个井区及其周围煤炭属性值的需要。该方法还提供了储层参数的真实分布以及它们在瓦斯枯竭期间如何变化，从而有助于煤层和煤层气管理。由 Elsevier B.V. 出版
Coal seam degasification is a means to recover energy from the methane gas retained in coal, and is also a supplementary measure to ventilation, which is proven to be one of the most effective ways to reduce methane emissions to a safe level in coal mines. Reservoir simulation is probably the most effective way to assess the coal seam as a "gas reservoir" and thereby its fluid-storage and flow-related properties. This objective is achieved by taking advantage of history matching of wellbore production.Reservoir simulation with multi-well history matching is a tedious process as important coal properties that affect wells' production characteristics are spatially variable across the seam. The common practice is to change various properties at the well blocks during the history matching process, and assume that they are uniform across the domain of interest. This process, however, often does not produce realistic and effective results for well or coal reservoir management In this work, a multi-level approach to coal bed reservoir simulation is demonstrated for a group of coalbed methane wells in the Illinois Basin producing from the Seelyville Coal Member of the Linton Formation of the Carbondale Group (Pennsylvanian) in Indiana. This approach includes, in order, gas and water deliverability analyses of wells, geostatistical simulation and co-simulation, and coal bed reservoir simulation. It is shown that a reservoir model, which utilizes the geostatistical maps of important coal properties, is effective for simultaneous history matching of all wells, and eliminates the need for guessing and changing values of coal properties at and around individual well blocks. This methodology also provides realistic distributions of reservoir parameters and how they change during gas depletion, and thus aids in coal seam and coal gas management. Published by Elsevier B.V.